ehds opened a new issue #847: 关于异步请求response分配问题导致的纯虚函数调用错误。 URL: https://github.com/apache/incubator-brpc/issues/847 **Describe the bug (描述bug)** 在官方示例asynchronous_echo_c++中，经response分配在栈上，异步请求在回调的Closure中不传入response即： ``` void HandleEchoResponse(brpc::Controller* cntl) {...} ``` 开启-O2选项，正常执行（猜测：response虽然在请求后被析构，但是done中没有使用所以正常执行） 但是关闭-O2编译选项后出现 ``` pure virtual method called terminate called without an active exception ``` 猜测：没有优化会引发未定义行为？ **To Reproduce (复现方法)** 在官方示例asynchronous_echo_c++中，将response在栈上分配，并且回调函数只传入Controller，关闭-O2选项。 **Expected behavior (期望行为)** **Versions (各种版本)** OS: ubuntu19.04 Compiler: GNU 8.3.0 brpc: 0.9.6 protobuf: 3.6.1 **Additional context/screenshots (更多上下文/截图)**
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